Isotopes/Atoms

Which number identifies the number of protons

• 12

• 24.305

• 24

• 24-12

Which of the following identifies neutrons?

• 13

• 26.982

• 27

• 27-13

Lithium has three isotopes. Why does the mass change in each?

• addition of protons

• additions of electrons

• addition of neutrons

• the mass doesn't change

In the picture, what does 3 represent?

• atomic number

• number of protons

• number of electrons in a neutral atom

• all of these are correct

Where is most of the mass in an atom?

• electron cloud

• nucleus

• it's equally distributed among the whole atom

• there is no mass in an atom

Using this element, how many electrons would be present?

• 108

• 47

• 61

• 107.87

How many neutrons would be present in this atom?

• 107.87

• 108

• 47

• 61

How many protons would be present in this atom?

• 35.453

• 17

• 18

• 35

Which of these represents protons plus neutrons?

• 16

• 8

• 15.999

• 16-8

Zinc-68 is not on the periodic table. Which of the following is true?

• Zinc-68 has a mass of 65.39

• Zinc-68 is an isotope

• Zinc-68 has 30 neutrons

• all of these are true